<template>
  <div class="login_container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" title="登录">
      <template #left>
        <van-icon name="cross" @click="$router.back()" />
      </template>
    </van-nav-bar>
    <!-- 登录表单 -->
    <van-form @submit="onSubmit" ref="loginForm">
      <!--
      表单验证：
        1、给 van-field 组件配置 rules 验证规则
          参考文档：https://youzan.github.io/vant/#/zh-CN/form#rule-shu-ju-jie-gou
        2、当表单提交的时候会自动触发表单验证
           如果验证通过，会触发 submit 事件
           如果验证失败，不会触发 submit
     -->
      <van-field
        name="mobile"
        placeholder="请输入手机号"
        v-model="user.mobile"
        :rules="userFormRules.mobile"
        type="number"
        maxlength="11"
      >
        <!-- 左侧图标 -->
        <template v-slot:left-icon>
          <i class="toutiao toutiao-shouji"></i>
        </template>
      </van-field>
      <van-field
        name="code"
        placeholder="请输入验证码"
        v-model="user.code"
        :rules="userFormRules.code"
        type="number"
        maxlength="6"
      >
        <!-- 左侧图标 -->
        <template v-slot:left-icon>
          <i class="toutiao toutiao-yanzhengma"></i>
        </template>
        <!-- 右侧按钮 -->
        <template #button>
          <!-- 倒计时 -->
          <van-count-down
            v-if="isCountDownShow"
            :time="60 * 1000"
            format="ss 秒"
            @finish="isCountDownShow = false"
          />
          <van-button
            v-if="!isCountDownShow"
            round
            size="small"
            type="default"
            class="send_sms_btn"
            @click="onSendSms"
            native-type="button"
            >发送验证码</van-button
          >
        </template>
      </van-field>
      <div class="login-btn-wrap">
        <van-button class="login-btn" block type="info" native-type="submit">
          登录
        </van-button>
      </div>
    </van-form>
  </div>
</template>

<script>
import { login, sendSms } from '@/assets/api/user';

export default {
  data() {
    return {
      user: {
        mobile: '13911111111', // 手机号
        code: '246810' // 验证码
        // mobile: '', // 手机号
        // code: '' // 验证码
      },
      userFormRules: {
        mobile: [
          {
            required: true,
            message: '手机号不能为空'
          },
          {
            pattern: /^1[3|5|7|8]\d{9}$/,
            message: '手机号格式错误'
          }
        ],
        code: [
          {
            required: true,
            message: '验证码不能为空'
          },
          {
            pattern: /^\d{6}$/,
            message: '验证码格式错误'
          }
        ]
      },
      // 是否展示倒计时
      isCountDownShow: false
    };
  },
  created: function() {},
  methods: {
    async onSubmit() {
      // 1. 获取表单数据
      const user = this.user;

      // TODO: 2. 表单验证
      this.$toast.loading({
        message: '登录中...',
        // 禁用背景点击
        forbidClick: true,
        // 持续时间
        duration: 0
      });

      // 3. 提交表单请求登录
      try {
        const { data } = await login(user);
        this.$store.commit('setUser', data.data);
        this.$toast.success('登录成功 ');
        // 登录成功，跳转回原来页面
        this.$router.back();
      } catch (err) {
        if (err.response.status === 400) {
          this.$toast.success('手机号或验证码错误');
        } else {
          this.$toast.success('登录失败，请稍后重试');
        }
      }

      // 4. 根据请求响应结果处理后续操作
    },
    // 发送验证码
    async onSendSms() {
      // 1. 校验手机号
      try {
        await this.$refs.loginForm.validate('mobile');
      } catch (err) {
        return console.log('验证失败', err);
      }
      // 2. 验证通过，显示倒计时
      this.isCountDownShow = true;
      // 3. 请求发送验证码
      try {
        await sendSms(this.user.mobile);
        this.$toast('发送成功');
      } catch (err) {
        // 发送失败，关闭倒计时
        this.isCountDownShow = false;
        if (err.response.status === 429) {
          this.$toast('发送太频繁了，请稍后重试');
        } else {
          this.$toast('发送失败，请稍后重试');
        }
      }
    }
  }
};
</script>

<style scoped lang="less">
.login_container {
  .toutiao {
    font-size: 37px;
  }
  .send_sms_btn {
    background-color: #ededed;
    height: 46px;
    line-height: 46px;
    font-size: 22px;
    color: #666;
  }
  .login-btn-wrap {
    padding: 53px 33px;
    .login-btn {
      background-color: #6db4fb;
      border: none;
    }
  }
}
</style>
